... into a cased well or an open hole to control its fluid flow. The first field study occurs at the kick-off stage, where both wells are close to vertical in terms of survey inclination. The other case involves the scenario of high-angle wells. The performance of active resistivity ranging is evaluated for both...

... for various applications such as collision avoidance, well interception, among others. Ultradeep harmonic anisotropic attenuation (UHAA) measurements are very sensitive to the proximity of an existing near-parallel metallically cased well or a conductive fluid-filled borehole. These UHAA measurements...

... spectroscopy measurements. When this lithologic information is combined with other measurements, definite improvements in the accuracy of porosity, water saturation and productivity predictions are observed. Stratigraphic interpretation is also significantly enhanced, especially in cased wells. SpectoLith...

... ABSTRACT A second logging instrument was designed and built by Para Magnetic Logging, Inc. (PML) to measure the resistivity of geological formations in steel cased wells. In principle, the new logging tool functions like a Laterolog 3 or guarded-electrode tool, but performs measurements...

... surveillance, in which resistivities can be directly compared to earlier resistivity logs. frequency return electrode log analysis patent borehole Upstream Oil & Gas Washington Gearhart industry cased well Symposium Formation Resistivity evaluation apparatus formation resistivity...

... be separated from those which originate in the 241Am source. The low energy data are processed by forming the ratios of Compton and photoelectric window count rates. These ratios have applications in both cased and uncased wells. The casing ratio has been calibrated to give the casing thickness in cased wells...